Re: same query but different result on pg16devel and pg15.2

On Tue, Apr 4, 2023 at 10:53 AM tender wang <tndrwang(at)gmail(dot)com> wrote:

> Hi hackers,
> I encounter a problem, as shown below:
>
> query:
> select
> ref_0.ps_suppkey as c0,
> ref_1.c_acctbal as c1,
> ref_2.o_totalprice as c2,
> ref_2.o_orderpriority as c3,
> ref_2.o_clerk as c4
> from
> public.partsupp as ref_0
> left join public.nation as sample_0
> inner join public.customer as sample_1
> on (false)
> on (true)
> left join public.customer as ref_1
> right join public.orders as ref_2
> on (false)
> left join public.supplier as ref_3
> on (false)
> on (sample_0.n_comment = ref_1.c_name )
> where (8 <= NULLIF(CASE WHEN (o_orderkey IS NOT NULL) THEN 4 ELSE 4 END,
> CASE WHEN (o_orderdate >= o_orderdate) THEN 95 ELSE 95 END))
> order by c0, c1, c2, c3, c4 limit 1;
>

It is the same issue as discussed in [1]. In this query the WHERE
condition is placed at the wrong place.

[1]
https://www.postgresql.org/message-id/flat/0b819232-4b50-f245-1c7d-c8c61bf41827%40postgrespro.ru

Thanks
Richard